Merge branch 'master' into amber_test

Author: Vasileios Karakasis

reframe/core/decorators.py

@@ -268,6 +268,10 @@ def required_version(*versions):
        Examples of non-compliant version numbers are ``3.5`` and ``3.5-dev0``.
        These should be written as ``3.5.0`` and ``3.5.0-dev.0``.
 
+    .. deprecated:: 3.5.0
+       Please set the ``require_version`` parameter in the class definition
+       instead.
+
     '''
     warn.user_deprecation_warning(
         "the '@required_version' decorator is deprecated; please set "

reframe/frontend/statistics.py

@@ -171,7 +171,7 @@ def json(self, force=False):
                     entry['result'] = 'success'
                     entry['outputdir'] = check.outputdir
 
-                if hasattr(check, 'perf_patterns'):
+                if check.perfvalues:
                     # Record performance variables
                     entry['perfvars'] = []
                     for key, ref in check.perfvalues.items():